Review on πΉ EHEIM Substrat Pro 2L - High-performance Biological Filter Media (Sintered Pearl-Shaped Glass) by Bogusawa Daczkowska α
A great option for this money, one of the best offers.
I have been using it for over 5 years. I change the filler 1 time in 3-4 years. Since I have 3 baskets with filler in the external filter (1 basket - ceramic rings, 2 and 3 - SubstratPro), I advise you to change first in basket 3 (the last one in terms of water flow) when replacing, and then after about a month change in the remaining one - so you will least damage the nitrogen cycle in the aquarium.
- Time-tested excellent filler for biological water purification in the aquarium.
- Expensive.
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